Today's nose dive another blow to mark zuckerberg, since his company went public, $7 billion of his fortune has evaporated. Reporter: Certainly not losing $50 billion, that's what facebook has lost since going public two months ago. He's seen $7.2 billion in net worth wiped out. It hasn't seemed to phase him. Since becoming a billionaire, he's lived a relativelily modest lifestyle. Marrying in a backyard ceremony, DINING at McDonald's on his honeymoon and taking advantage of record-low rates to redo his mortgage. If he's in no hurry to make money, his investors are. From eye stock perspective, the things people look at to evaluate a stock are totally different. Reporter: The big problem, more than half of facebook's one billion users, log on to the site via smart phones and black berries. Facebook has yet to find a way to profit from mobile log-ins at way it does on desk tops. I asked the analyst in the piece when he thought the investors would like the stock again, he said maybe after another 30% drop. Allowing the longer term investors to some time for them to do what it needs to do. We'll see you tomorrow morning on gma. Still ahead here on "world news," the body of a gold medalist past in days gone by,

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